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AI security, written by people who ship the controls.

Architecture patterns, framework comparisons, and incident retrospectives from the Stack Vault engineering team. No abstractions, no vendor fluff.

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Latest from engineering

Architecture, evaluation, incident response, and the boring middle of running AI in production.

Architecture 8 May 2026

Why We Stopped Sandboxing Agents and What We Do Instead

Sandboxes don't survive contact with multi-step plans. The capability-graph approach that replaced ours, and what it cost.

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Patterns 4 May 2026

A Pattern Language for LLM Output Validation

We catalogued 31 output-validation patterns across our customers. The 8 that worked, the 14 that mostly worked, and the 9 to avoid.

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Eval 29 Apr 2026

Reference-Free RAG Evaluation: A Year of Calibration Data

Twelve months of reference-free RAG scoring against ground truth. Where it works, where it falls apart, and how we calibrate.

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